Apparatus for constructing plaster board



Nov. 11,

C. R. BIRDSEY APPARATUS FOR CONSTRUCTING PLASTER BOARD Filed Oct. 6.1921 Patented Nov. ll, 192d.

tense? FATENT FWQE.

CHARLES R. BIRDSEY, OF HINSDALE. ILLINOIS, ASSIGNOB T0 UNITED STATESGYPSUM COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

V APPARATUS FOR CONSTRUCTING- PLASTER BGABD.

Application filed October 6, 1921. Serial No. 505,849.

To all whom it may concern:

Be it known that I, CHARLES R. BIRDSEY, acitizen of the United States,residing at Hinsdale, in the county of Du Page and State of Illinois,have invented certain new and useful Improveme'ntsin Apparatus forConstructing Plaster Board, of which the following is a description.

My invention belongs to that general class of inventions relating to themanufacture of plaster or wall board, and relates particularly to themethod and apparatus for constructing an improved board.

The invention has among its objcctsthe production of an improved boardand an improved method of constructing the same.

The invention has among its further objects the production of a simple,efiicient, durable and sati factory apparatus for carrying out themethod herein described.

Many other objects and advantages of the construction herein shown anddescribed will be obvious to those skilled in the art from thedisclosures herein given.

To this end my invention consists in the novel construction, arrangementand combination of parts herein shown and described, and moreparticularly pointed out in the claims.

In the drawings, wherein like reference characters indicate like orcorresponding parts;

Fig. l is substantially a view in elevation and partly in section,illustrating one form of the apparatus suitable for carrying out themethod;

Fig. 2 is a sectional view taken substantially on the line 2-2 of Fig.1;

Fig. 3 is a sectional view taken substantially on the line 33 of Fig. 1;

Flg. 4 is a swtional view taken substantially on the line H of Fig. 1;

Fig. 5 is a sectional view taken substan tially on the line 55 of Fig.1;

Fig. 6 is a sectional view through a.

portion of a board constructed by a slightly modified apparatus;

Fig. 7 is a sectional view corresponding to Fig. 4, illustrating themodified apparatus;

Fig. 8 is a perspective view of one type of completed board, with aportion broken away to show the construction, and

Fig. 9 is a similar view of another type with the edge of one sheetraised to show the construction.

- and 9 and 10 the cover sheets.

and with the apparatus herein illustrated,

itbeing understood, however, that the method and apparatus may beemployed for constructing'boa-rd of any type of overlapping coversheets, which sheets are to be secured together. The board shownconsists of a body of plastic material, such as gypsum, plaster or thelike, it being understood that any equivalent for the prt'posemay beemployed which is enclosed or covered by a covering of suitablematerial, paper or the like being generally preferred for the purpose.

In the type of board shown in Fig. 8, 1 represents the plaster body and2 and 3 the cover sheets. With the particular type 0t board hereinillustrated, sheet 2 is turned over the edge 4, generally at bothopposite edges of the board, with the extreme edge '5 at each .side bentor folded over so as to overlap the extreme edge of the cover sheet 3and bod of the board disposed between the cover s eets. The cover sheetsare suitably secured together, as will be hereinafter referred to. Withthe type of board illustrated in Fig. 9, thesame is substantiallysimilar to the board shown n Fig. 8, except that the cover sheets arearranged in a different overlapped relation. Referring to this figure, 8represents the plaster body In this case the cover sheet 9 is folded up,as at 11, at the desired edges'of the board and thence over 12, theextreme edge of the cover sheet 10 being arranged on the exterior of theflap or folded over portiony12.

Heretofore it has been customary to make plaster board and seal, bind orseems the sheets together by means of the plastic material itselfforming the body, the same serving to fasten the edges together wherethey overlapped. In the present case I stick or secure the overlappingpaper cover sheet material together byemploy'mg an independent stickingor securing mfimm. Thus ticular medium may be as desired, for example,silicate of soda, ordinary rice-flour paste and glue are some of themediums that may be'employed. 3

In the ire-wings, I have intimated the sticking medium or securing meansas applied in a series of dots or spots 15, it being understood that thesame may be continuous or in a series of breaks, and in such quantity asto secure the desired result.

Referring to Fig. 1, 16 represents a suitable support as shown, the samebeing in the form of a belt conveyor carried by the. rolls 17, theparticular type of support, however, is not necessarily limited to amoving belt type, such as is shown. The conveyor or support 16 supportsthe cover sheet 2, the same being of the desired width and preferably,but not necessarily, scored ,or indented, as indicated at 19 and 20 toproduce the desired form of edge. The other cover sheet 3 is fed downand passes under the roll 18, the material 1, such as plaster or stuccoof the desiredmixture, being deposited, in the case illustrated on thesheet 2 in advance of the roll 18, so that as the paper sheets andlastic mass pass under the roll 18, the board 1s gauged and made thedesired th ckness as well as width. I have not considered it necessaryto herein .illustrate in detail the mixing of" the batch and applying ofthe same to the machine, as any of the satisfactory methods now employedin the industry 1 may be employed with the machine herein shown. Forillustration, 13 represents a conveyor for supplying the batch ofmaterial. There is preferably provided side folders 21, which areconstructed to support the edge portions 45 of the under sheet inadvance of the roll 18, and preferably in advance of the point where thematerial is applied to the sheet, so that the sheet itself formsa'trough confining the material and to a large extent assists in shapingthe board as the material may flowout to the edge and it may be sofedonto the sheet that there is sufiicient material for the purpose and.yet not a surplus. It will be noted by referring to Fig. 3 that theupturned edge portion 5 is brought substantially close to the end of theroll 18, the sheet 5 being preferably but not necessarily a width to fitor extend substantially to the edge portion 4 of the lower sheet; Afterthis type of board has been substantially formed in the manner mentionedand while the edge 5 is still maintained up, the sticking or securingmedium 15 is deposited or applied to one or the other of the sheetsbefore the edge is turned down.

In the mechanism illustrated I have applied the paste or sticking mediumto the sheet 3 at a point adjacent the edge, so that it will be withinthe confines of the board edge and the extreme free edge of the portion5 when it is folded over. The sticking medium in the case illustrated isapplied by means of a container 22, having a discharge nozzle 23,24=being a valve or the like for controlling the rate of discharge. Thesticking medium may be. fed by gravity or force feed, as desired.

After applying the paste, the edge portion of flap 5 is then turned downand it is not only found desirable to turn it down, but generallypreferred to also maintain it in contact with the. sheet 3 until thepaste,

glue or sticking medium has set. The folding member 21 may beconstructed to turn over the portion 5, or any equivalent means appliedfor the purpose herein. As shown, there is provided a roll 25, underwhich the board passes after the portion 5 has been turned down, sothatif the portion 5 turned down is started under the roll, it willautomatically follow under the roll and be turned down by the roll. I

In the type of machine illustrated in Fig. 1, I have provided two rolls,25, 27 ,26 being a belt extending over the same and arranged tocooperate with the board passing thereunder. There may also be providedone or more rollers 28, or the equivalent, which maintain the beltagainst the board. It may be mentioned that, if desired, rolls 29, oranyequivalent therefor, may be provided at the side edges so as to maintainthe same asdesired, and also to gauge the width of the board so as toproduce a uniform product. While a square edge is shown, this isimmaterial, as the edge may be shaped in any desired manner, and thismay be controlled, as desired, by varying the scoring previouslyreferred to, as well as by modifying the shape of the rolls 29, or theequivalent if provided.

As illustrated, I have so arranged the parts that the flap portion 5will be turned down and pressed slightly inwardly so that the outer faceof the board is substantially flush from edge to edge.

The type of board illustrated in Figs. 6, 7 and 9 is substantiallysimilar, except in this case the flap portion 12 is turnedinwardly andover the material 8, and the edge portion of the sheet 10 maintained upor supported until the sticking means is applied. In the apparatusillustrated, the member 31 forms the two functions of maintaining themember 12 asv shown, and at the same time maintains the edge portion ofthe sheet 10 in such position that the sticking medium may be applied.The particular apparatus for applying the sticking medium is similar tothat shown, 34 representin a container, conduit or the like, providedwith the nozzle 35 arranged to discharge paste 15 in the desired manneron the inturned flap 12. After the paste 'is applied, the edge portionof the upper sheet is permitted to drop over the flap 12; the rollerspreviously mentioned function in the same manner as described.

It will be seen from the preceding that other sheet.

once I do not wis misses as the paper is fed into the/machine and theplaster or stucco, or the equivalent, applied thereto, the board isshaped, the sheets being maintained in position to permit the ap?plication of. the sealing compound and thence the sheets folded, pressedtogether andmaintained in contact until the com pound has setsuficiently to maintain the sheets together. The board is shaped anddischar ed from the machine in the proper size an form, and may be cutinto lengths,

as desired. It will be noted that, if desired, one edge may be formed inone manner and the other in the opposite way, orgequivalent or desiredmanner.

Having thus described my invention, it is obvious that' variousimmaterial modifications may be made in the same without dearting fromthe 's irit of my invention; E h to be understood as limiting myself tothe exact form, construction, arrangement and combination of partsherein shown and described or uses mentioned.

What I claim as new and desire to secure by Letters Patent is:

1. An apparatus for making plaster board in a continuous process,comprising means for sup-porting and advancing a cover sheet, means forbending up an edge thereof, means for covering said sheet with plaster,means for'tadvancing a top cover sheet over said plastered sheet, meansfor supporting the free edge of one of said sheets out of contact withsaid plaster, means for applying adhesive substance adjacent te the freeedge of the other sheet, and means for overila ping said supported edgeof the one sheet L 2. *An apparatus for making plaster board 1n acontinuous process, comprising a traveling table adapted to receive andsupport a cover sheet thereon, means for bending up opposite edges ofsaid sheet, means for coverlng said sheet with plaster between the bentedges and enclosing said plaster, means for applying a second coversheet over said plaster on said bottom sheet, means for holding theedges of one of said sheets out of contact with said plaster, means forapplying adhesive to the exterior surface of the edge of the sheet incontact with said plaster, and means for. thence overlapping the innersurface of said edge held out of contact over the exterior of said adhesively treated edge.

3. An apparatus for making plaster board in a continuous process,comprising means for supportin an advancing cover sheet, means for bening up an edge thereof, means for covering said sheet with plasterbetween said bent up edges, means for advancin a top cover sheet oversaid plaster and ower sheet, means for maintaining the edge of one ofsaid sheets out of contact with said plaster, and simultaneouslyapplying adhesive substance to the exterior surface ofthe edge of theother sheet, and means for overlapping said edge maintained out ofcontact with said plaster over the adhesively treated edge.

In testimony whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses. 1

CHARLES R; "BIRns Y.

out of contact with said plaster 'over Witnesses:

and onto the adhesively treated edge of the Roy W. HI L, RUTH M.EPHRAIM.

